The North Fork of Suffolk County, New York, is a peninsula in the northeast part of the county on the North Shore of Long Island. The southeast part of the county is an even longer peninsula, called the South Fork.

The North Fork is composed of all of the Town of Southold in the east and part of the Town of Riverhead in the west. The body of water north of this region is the Long Island Sound. The southern water boundary comprises several connected bodies of water, including the Great Peconic Bay, Little Peconic Bay, and Gardiners Bay.

Lying between the North Fork and the South Fork, are several islands, including the two large islands of Gardiners Island and Shelter Island. The dividing line between the two forks in the west is the Peconic River.

The easternmost tip of the North Fork is Orient Point. Beyond that point is one additional significant part of the Town of Southold, Plum Island.

The North Fork offers beautiful views of the Long Island Sound and Peconic/Gardiners Bay. Wineries, raspberry patches, and sod farms are what characterize the North Fork. The tip of the fork is Orient Point State Park. Areas like East Marion, Southold, and Greenport are just some of the towns to see along the way on the North Fork. The North Fork also offers great fishing, crabbing, and clamming spots along the bay or sound. Greenport often sells these fish in their incorporated village.

From the North Fork, visitors can access via ferry Shelter Island, which sits in the Peconic Bay. Ferry service is available on the bay side of the fork as well.